85TurboTurd

This is my first post here so sorry if things aren't as they should be.

I recently purchased a 1985 turbo Z31 5 speed. It's 99% all original with 200k miles. Ever since I bought it there has been a issue with it staying running. It fires up and idles fine besides a large exhaust leak at the manifold I'm attempting to fix. I have the gaskets just can't get the cross over pipe off. But once ive driven about 4 miles it seems to loose fuel then sputter out. Like I can pump the gas and she tries to rev but can't seem to do it and then shuts off and won't start until it cools down. The previous owner said it was a bad alternator. Replaced that still didn't help. I read that it could be the CHTS. Checked that. It's already been replaced. I read that it could be the ignition control module. Checked that it's already been replaced too. The old melted one is in my glove box.

I'm at a loss here and don't know where to start next. I don't know if the exhaust leak could be the cause so I'm fixing it. Could it be something with the fuel pump? Thermostat? I've been searching for the whole 4 days I've had the car and still can't figure out what it could be any help would be great.

rogerz

unplug the O two sensor quite likely the culprit. if it doesn't die after heating up you know the answer.

85TurboTurd

that was next on my list. I won't know until I can get the passenger exhaust manifold back on. Previous over broke 3 studs off in the head and tried to goop 10 pounds of silicone on it to fix the leak. Didn't work so he parked it in a field for 6 years. So I'm getting ready to weld a nut to the studs and remove them. After that I can start the motor and test the 02 sensor and FPR.

ken99

You may find that getting the exhaust manifolds bolted back up proper with new gaskets has solved the problem, and that the O2 sensor may be OK.